scripts/install: cleanup old init support

Signed-off-by: Stephan Raue <stephan@openelec.tv>
service.openelec.settings: port backup restore script to systemd

Signed-off-by: Stephan Raue <stephan@openelec.tv>
service.openelec.settings: port reset scripts to systemd

Signed-off-by: Stephan Raue <stephan@openelec.tv>
busybox: rework 'debug-shell.service', should not start to early to dont lock /storage for possible umounts

Signed-off-by: Stephan Raue <stephan@openelec.tv>
service.openelec.settings: rework backup-restore systemd service

Signed-off-by: Stephan Raue <stephan@openelec.tv>
systemd: rework userconfig.service

Signed-off-by: Stephan Raue <stephan@openelec.tv>
systemd: rework debugconfig.service

Signed-off-by: Stephan Raue <stephan@openelec.tv>
service.openelec.settings: add missing service file

Signed-off-by: Stephan Raue <stephan@openelec.tv>
systemd: cleanup

Signed-off-by: Stephan Raue <stephan@openelec.tv>